Cutter-head.



A. B. LANDISL CUTTER HEAD.

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CUTTER HEAD. APPLICATION FILED FEB.2,1910.

Patented Feb. 20, 19 12.

3 SHEETS$HEET 2 A TTOkA/EY.

AIB. LANDIS.

CUTTER HEAD,

APYLIGATION FILED F232, 1910..

l,@17,886n I Patented Feb. 20, 1912.

3 SHEETS-SHEET 3.

IVJTNIiSSES; INVENTOR. f. M

- .1 Q. BY

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ENETEE d ihdd fid ABRAHAM B. LANDIS, 6F i/VAYNESBOEQ, PENIISZLVAEII'Z.

CUTTER-HEKAD.

Specification of Letters Patent.

Patented Feb. 2d, 1%.2.

Application filed February 2, 1910. Serial No. 541,565.

To all whom "it may concern:

Be it known that I, ABRAHAM B. LANDIS, a citizen of the United States, residing at lVaynesboro, in the county ofFi-anklin and State of Pennsylvania, have invented certain for cutting threads on bolts, screws, etc, said invention relating principally to the means for securing the cutter in the cutter-holder, whereby said cutter may be secured "in a; rigid manner and easily and conveniently released and adjusted, all as will be herein-;

after more fully described and claimed.

Referring to the accom anying drawings which are made a part hereof and on which similar reference characters indicate similar parts, Figure 1 is a front elevation of the cutter-head embodying my said improve ment, Fig. 2 a longitudinal section through the same on the dotted line 2 2 in Fig. 1,

except that part of the rim is shown in ele-.

vation, Fig. 3 a fro fielevation of the holder, Fig. 4 a side elevation with a portion-in section to show the means for securing and adjusting the cutter, more "clearly, Fig. 5 an underside plan of the structure as shown in Fig. 4, Fig. 6 a view similar to Fi 4 showing a modified construction, Fig. 4 a detail View on the dotted line. 7-7 in Fig. 1, and

Fig. 8 aview showing an end and side elevation of thepin on which the clamping memher is mounted.

Insaid drawings the portions marked A represent the body, orframe, of the cutterhead, B thecutter-holders, and (l the cutters or chasers.

The body, or frame, A is, or may be, of any approved construction, preferably of the form ,more fully illustrated and described in my application No. 529,152, filed November 20, 1909. It is formed with the bearings for the cutter-holders located equidistant around a central aperture and is adapted to be secured on the end of the spindle 1 of the vmachine in any approved manner. It is provided .with a part A, whichsurrounds the body and is adapted to have a limited longitudinal movement thereon. .Bearings a are carried in the outer end of said part between which andthe outer end of the cutter-holders are interposed toggle pinsa.

The construction and arrangement of the adjusting mechanism for regulating the size of the die are shown in detail in Fig. 7, the operation of which being "fully described in my above named app ication need not be re posted herein. It will be understood, however, that any other form or arrangement of adjusting mechanism found appropriate may be used.

The cutter-holders B are each of the form best shown in Figs. 3, d, 5 and 6 and consist of a trunnion adapted to be mounted in one of the bearings provided therefor in the body A, said trunnion carrying on its for- ,,u'..ard end a part B which projects to one side of the axis of said trrtnnion and is formed with a right-angle recess in its face to receive the cutter. It is also provided with a bearing 6 for the inner end'of the toggle pin a. The face of the right-angle rocess which is in line with the axis of the trunnion is formed with a longitudinal dovetail shaped groove, which forms an over- .hangingouter holding flange or edge that is solid, or in piece, with the holder, and a. longitudinal groove adapted to receive the inner edge of the cutter is formed in the face which extends at right angles with said axis. The rigid holding flange on the outer edge of the holder furnishes an unyielding support for the cutter us against the strain incident to its engagement with the work in drawing the some into the die.

Each of the cutters C is a block of steel of appropriate dimensions having cutting grooves extending longitudinally of its face and formed with a rib on its back the outer edge of which is tapered to correspond to the tapered outer edge of the dove-tail shaped recess in the part B. The inner edge of the cutter projects into the longitudinal slot or groove in the other face of said recess. A cam lever 10, mounted on a pin 11, adapted to bear with its cam face against the inner edge of the cutter. Said lever projects outwardly through a recess in the part B and a coiled spring 12 mounted with one end ina recess in said part B and its other end in a recess in the adjacent side 4 0t lever 10 and near its outer end tends to force said outer end over on its pivot so that its cam will bear against the inner edge of the cutter C and force the tapered edge of 3 under the over-ha 'olid flange it'orin i t l3, and thus all' iz' 'l" 'l.'l and eliicicnt sir 'IJ the Work. x P i-iengag as "av-threads in. the back oi the rib (7, ho niountvd to tu n in a. sea In the part- .il. serve the mains ling and :id ust l0: ing .ttor iongitu. A hand lo 15 19 18 CG? .tcd with (he outenend of lever by which it may be rcmiilv o 1 cralcd against the pro. '3 o .pring l; to release the engagement of its can; with the inner edge of cutter C. "When said can: is thrown over out of ciigejairoinent with said edge the cutter m t he slid transversely in the slots with which it 'agcs suliicientl v to permit the dove-tail connection to be disengaged, when t l cutter may be readily removed. The 2Q same operation. takes place in placing said cutter in. position, the cam being thrown over siiliiicicntly to permit the cutter to be inserted in the grooves, when the lever is released and iring 12 operates to Secure the ri id enga merit of the parts. It will be noticed that the top inner edge of the cutter is slightly beveled wl'iich permits he same to be tilted slightly when being in sorted and r vcd from the groove and thus enables ti 4 adjustment to he made more readily.

ln 8 l have shown a preferred form o: the pin ill, which shows the hearing on which the lever 10 is mounted as somewhat itric to the axis, the purpose of pen ting adjustment by to ning to comp-Lnsate for any slig t' variation due to wear, or for other reasons, so that the clamping lever 10 will always hold at about 40. the same position.

l n 6 shown substantially thesamc arr mcnt except that in lieu of a clamplever mount-' l on a pin o pivot I have we c clampin fix) :mountmfl hearings in the part 5 and adapted to bear directly against the in ner edge oil the cutter or chaser. it lever 21 extends up from said pin and a bearing head 9a? is held aga nst said lever by spring .23. which s irves to rorce said eccentric into clam ing r laticnship with the cutter, or

pin or cvlin I 1. r. it cna carts bei otherwise the same own in the prin al. views.

-.. avi.ng thus fullv ncribed mv said invention, what I claim as new and desire to secure by Letters Tateat is:

. 1 i l. cuttc. -head t mprising holder, a cutter mounted in H in said cutter-holder, said holder and c: ter being formed with interen parts and ms and cutters mounted therein each of said cutter-ladders being formed with a recess to receive the cutter and each of said cutters being formed with a projection adapted to engage with said recess. and a cam 7 adapted to engage with one edge of said cutter for holding it in position, substam Hall; as set forth. i

3. In a cutterhead, the combination of the frame or body, the cutter-holders mounted therein, the cutters mounted in said cutter-holders each of said cutter-holders being formed with a dove-tail shaped groove and each of said cutters being formed with a tapered projection adapted to engage with 30 said groove and a spring pressed cam for holding said cutter in place, substantially as set forth.

1-. A cutter-head comprising cutter-b9101- crs, cutters mounted in said holders, each of 3'5 said holders being formed with a, groove having an overhanging edge and each of said cutters being formed with a rib or projection having an edge adapted to engage with the overhangingedge of said groove, said cutters being mounted to slide transversely into and out of said engagement, a cam adapted to engage with each cutter for holding it into engagement, and means for operating said cam, substantially asv set forth. g

A cutter-head comprising cutterhold: each formed with a recess and a groove formed in the back face of said recess hav- 'ing an overhanging or tapered edge and another groove or slot formed in the edge face of said recess which extends" at right-angles to said first mentioned face, cutters mounted in, said recesses each being formed with a rib on, its back having a tapered edge adapted to engage with the tapered edge of groove in the back face of said recess and the inner edge of said cutter being adapted to engage with the slot or groove in the edge face of said recess, a pivoted cam engaging with the inner edge of said cutter and a spring for forcing said cam into contact with said inner edge and holding it in place, substantiallv as set forth.

(MA. cutter-head comprising cutter-holders each formed with a right angular recess to receive the cutters, a tapered groove being formed in one face of said recess and a groove or slot being formed in the other face, cutters each formed with a longitudi- 1 0 nal rib on its back having one edge formed tapered to engage with the tapered edge of said groove and the inner edge of said outters being adapted to be inserted in the groove in the other face of said recess, a pivoted lever with a cam on one end adapted to engage with the inner edge of said cuttor, a spring bearing against said leverfor forcing said cam against the inner edge of said cutter, and a handle for operating said 1,o17,sse

ers each formed with a cutter receiving 1'e cess in its face With an overhang ;ing z; engaging flange, a cutter mounted in each reoess formed with a part one edge of which closely engages under said flange, pivoted cams for holding said cutters inplace, eecentric bearings for said cams mounted .to be turned for. adjustment, and means for I operating said cams, substantially as set forth.

In witness whereof, I, have hereunto set my hand and seal at Washington, District 15 of Columbia this 2nd day of February,

A. D. nineteen hundred and ten.

ABRAHAM LANDIS. [L. s.]

' Witnesses:

\V. BRADFORD, J. D. YOAKLEYQ 

